B7AH-R6D53 datasheet(73/121 Pages) OMRON

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B7AH

Precautions

General

Common Precautions

The B7AH performs 1-to-1 communications and does not require a

communications master. It cannot be connected to CompoBus/S

transmission paths from OMRON remote masters.

Do not use the B7AH in locations subject to corrosive gases.

When using the B7AH in locations where a large amount of static

electricity is generated (e.g., molding materials, powder, or fluid

materials conveyed along pipelines), install the B7AH at least 1 m

away from the source of the static electricity.

Line Resistance in the Transmission Path

If power and signals are transmitted together along 3-core cable,

ensure that the line resistance in the transmission path between

Link Terminals is less than 2.5

Ω. (The same value applies even if

terminal blocks, connectors, or slip rings are used at points on the

line.) If the line resistance rises to a value greater than this, the cur-

rent flowing to 0 V and the line resistance will cause a large voltage

drop, preventing normal transmission and generating an error. As a

rough guide, the line resistance with a VCTF cable of thickness

0.75 mm2 will be 2.5

Ω per 100 m.

Connection to 10-point B7A Terminals is not possible because

transmission signals are not compatible.

If there is a possibility of shocks or vibration, prevent the pins being

damaged by securing the Link Terminal to the PCB using an (e.g.,

epoxy-based) adhesive.

Do not touch the pins. Doing so may cause deformation. In addition,

touching the pins in an ungrounded state may result in damage to

internal elements due to static discharge. Use an anti-static mat dur-

ing work to ensure that the body is in a grounded state.

Soldering

When soldering using a soldering iron or a soldering bath, solder in

less than 5 s at a temperature not exceeding 260

°C. Do not use

reflow soldering.

Cleaning

Do not use highly acidic or highly alkaline solvents to clean the PCB.

Power Supply

Be sure to use the specified power supply voltage. Do not use a

power supply that has a large ripple or intermittently generates

abnormal voltages.

Noise and Miswiring Protection Circuits

If there is a possibility of noise interference between the power sup-

ply pins (+V and –V or VDD and VSS) or at input or output pins (IN00

to IN15 or OUT00 to OUT15), or if there is a possibility of miswiring

the signal pin (SIG) and the positive power supply pin (+V or VDD),

include the protection circuits described on page 68.

Wiring

Do not wire transmission lines parallel to, and less than 10 cm away

from, lines carrying high voltages or currents. If transmission lines

are installed less than 10 cm away from potential sources of noise,

confirm that correct operation is possible before using the Link Ter-

minal in actual operation.

Do not perform wiring with the power supply turned ON. Doing so

may cause pins to be accidentally short-circuited, resulting in dam-

age to internal elements and communications failure.

If the SIG pin and the positive power supply pin or the VDD (+5 V)

pin are shorted during communications, the Link Terminal will mal-

function and normal communications will not be possible. Confirm

that power lines are not shorted before turning ON the power.

Be sure to apply the specified power supply to the power supply pins

(positive, negative, VDD, and VSS). Applying excessive voltages

(e.g., 100 VAC) will cause the Link Terminal to malfunction and nor-

mal communications will not be possible.

Shorting (no-load state) the OUT pins of Output Link Terminals dur-

ing communications will cause the Link Terminal to malfunction. Be

sure to connect a load within the specified load current range. When

measuring the current with a tester, measure with the load supplied.

Recommended Cables

Normal-speed Models

Cabtire Cables

With a single power supply connected to Input or Output Link Termi-

nal:

0.75-mm2 VCTF cable

× 3

With independent power supplies connected:

0.75-mm2 VCTF cable

× 2

The following cables can also be used:

Twisted-pair Cables

(If only a single power supply is used, a conductor of thickness

0.75-mm2 min. is required.)

Transmission distance: 100 m max.

High-speed Models

Shielded Cables

Use cables for which the cross-sectional area of the conductor is at

least 0.75 mm2.

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